Coarse and fine aggregate screening device for building concrete recycling

Abstract

The invention discloses a coarse and fine aggregate screening device for building concrete recycling, and belongs to the technical field of building construction. The screening assembly comprises end plates which are symmetrically arranged, a through hole is formed in the middle of each end plate, a plurality of guide holes which are evenly distributed in the circumference are formed in the outer side of each through hole, screening rods are arranged in the guide holes, the ends of the screening rods are located in the guide holes, and a plurality of traction assemblies are arranged on the portions, on the outer sides of the guide holes, of the end plates. The multiple traction assemblies are arranged in a staggered mode, each traction assembly comprises an arc-shaped rack, an arc-shaped groove is formed in the end plate, the arc-shaped racks are slidably connected into the arc-shaped grooves, a driving gear is arranged on the outer side of each arc-shaped rack, the driving gears and the arc-shaped racks are arranged in a meshed mode, and a driving motor is arranged on the end plate. And the driving motor is fixed on the end plate. According to the technical scheme, the problem that in the prior art, due to the fact that screen meshes of a screening device are blocked, use is inconvenient is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a coarse and fine aggregate screening device for recycling building concrete. Background Art

[0002] In the process of recycling existing building concrete, the block concrete needs to be crushed first, and then the coarse aggregate (gravel) and fine aggregate (sand) in the crushed concrete are screened to separate the two for subsequent separate recycling.

[0003] Traditional screening methods usually use vibrating screens or drum screens for screening. However, when this screening method is actually used, the screen holes will be blocked by coarse aggregate or adhered by fine aggregate, resulting in poor screening effect. In addition, the blocked screen holes need to be manually cleaned, which is very inconvenient to use. Therefore, a coarse and fine aggregate screening device for recycling building concrete is proposed. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a coarse and fine aggregate screening device for recycling building concrete, so as to avoid the problem that the screen holes of the screening device in the prior art are blocked, resulting in inconvenience in use.

[0005] In order to achieve the above object, the present invention provides the following technical solutions: The present invention discloses a coarse and fine aggregate screening device for recycling building concrete, comprising a screening component, a material receiving component and a driving component, wherein the driving component is used to drive the screening component to rotate, the screening component is used to separate the coarse aggregate and the fine aggregate, and the material receiving component is used to respectively discharge the coarse aggregate and the fine aggregate separated by the screening component; Wherein, the screening assembly includes a symmetrically arranged end plate, a through hole is provided in the middle of the end plate, a plurality of circumferentially evenly distributed guide holes are provided on the outer side of the through hole, screening rods are provided in the guide holes, the ends of the screening rods are located in the guide holes, a plurality of groups of pulling assemblies are provided on the end plate outside the guide holes, and the plurality of groups of pulling assemblies are staggered, the pulling assembly includes an arc-shaped rack, an arc-shaped groove is provided on the end plate, the arc-shaped rack is slidably connected in the arc-shaped groove, a driving gear is provided on the outer side of the arc-shaped rack, the driving gear and the arc-shaped rack are meshed, a driving motor is provided on the end plate, and the driving motor The machine is fixed on the end plate, and the output end of the driving motor is fixed on the driving gear. The screening rods are provided with connecting rods, one end of several of the connecting rods is rotatably connected to the screening rods, and the other ends of several of the connecting rods are rotatably connected to several of the arc-shaped racks. When any group of the pulling components moves to the upper space position, the driving motor drives the driving gear to rotate, the driving gear drives the arc-shaped rack to rotate, the arc-shaped rack pulls the connecting rod to move, and drives the screening rod to move in the guide groove, thereby adjusting the spacing between adjacent screening rods, and thereby discharging the coarse aggregate clamped between the adjacent screening rods.

[0006] Furthermore, a plurality of connecting columns with T-shaped cross sections are provided in the arc-shaped groove, the vertical portions of the connecting columns pass through the arc-shaped groove and are fixed on the arc-shaped rack, and the transverse portions of the connecting columns are in sliding contact with the end plates.

[0007] Furthermore, the connecting rod includes an inner rod and an outer rod, one end of the outer rod is provided with a sliding groove toward the middle, one end of the inner rod is provided with a sliding block, one end of the sliding block is fixed to the end of the inner rod, the other end of the sliding block is slidably connected to the sliding groove, a plurality of traction springs are provided in the sliding groove, one end of the traction spring is fixed to the other end of the sliding block, and the other end of the traction spring is fixed to the end side of the sliding groove.

[0008] Furthermore, a delay structure is provided on the outer side of the connecting rod, and the delay structure includes a fixed vertical plate, one end of the fixed vertical plate is detachably connected to the end plate, and a fixed cross plate is provided on the other end of the fixed vertical plate, one end of the fixed cross plate is rotatably connected to the fixed vertical plate, and a return spring and a baffle are respectively provided on both sides of the fixed cross plate, and the baffle is arranged toward the arc-shaped rack, one end of the return spring is connected to the fixed vertical plate, the other end of the return spring is connected to the fixed cross plate, one end of the baffle is connected to the fixed vertical plate, and the other end of the baffle is abutted on the side surface of the fixed cross plate, and a rubber baffle is provided on the inner rod of the connecting rod, one end of the rubber baffle is fixed to the inner rod, and the other end of the rubber baffle is slidably abutted on a side surface where the fixed cross plate is connected to the return spring.

[0009] Furthermore, a sieve plate is sleeved on the portion of the sieve rod located between the symmetrically arranged end plates, and the sieve plate is arranged in an arc shape.

[0010] Furthermore, the driving assembly includes a support frame, both ends of the support frame are symmetrically provided with support wheels, at least one of the support wheels is provided with a rotating motor, and a support ring is provided on the outer surface of the end plate, one end of the support ring is connected to the end plate, and the outer surface of the support ring is in contact with the support wheel.

[0011] Furthermore, a protective cover is provided between the end plate and the support ring, a feed port is provided in the middle of the protective cover, one end of the protective cover is fixed to the end plate, the other end of the protective cover is fixedly connected to the support ring, a feed pipe is provided in the feed port, and the outer surface of the feed pipe is fixed to the feed port.

[0012] Furthermore, a retaining ring is provided on the inner side surface of the end plate, one end of the retaining ring is fixed to the end plate, and the retaining ring is located between the screening rod and the arc groove.

[0013] Furthermore, the material receiving assembly includes a symmetrically arranged fixing plate, a connecting shaft is provided at the end of the fixing plate, a material receiving plate is provided on the connecting shaft, the middle part of the material receiving plate is rotatably connected to the connecting shaft, an avoidance groove is provided in the middle part of the material receiving plate, a screw is provided at one end of the avoidance groove, the screw is located in the avoidance groove, a connecting spring is sleeved on the screw, one end of the connecting spring is fixed to the material receiving plate, a locking nut is provided at the other end of the connecting spring, and the locking nut is threadedly connected to the screw.

[0014] The beneficial effects of the present invention are: In the present technical solution, when any group of pulling assemblies moves to the top of the spatial position, the rotating motor moves to increase the spacing between adjacent screening rods, thereby loosening the coarse aggregate blocked therein, causing the coarse aggregate to fall downward under the action of gravity, thereby avoiding the problem of blockage. That is, the present technical solution uses the screening assembly rotated to the lower position for screening, and rotates to the upper position for discharging the blocked coarse aggregate. That is, during the entire rotary screening process, screening can be achieved while eliminating the hidden danger of blockage, thereby avoiding the problem of "sieve holes" being blocked during screening, thereby improving the screening effect.

[0015] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration: Figure 1 It is a three-dimensional schematic diagram of the coarse and fine aggregate screening device of the present invention; Figure 2 It is a three-dimensional schematic diagram of the screening assembly in the coarse and fine aggregate screening device of the present invention; Figure 3 It is a three-dimensional schematic diagram of the material receiving part of the coarse and fine aggregate screening device of the present invention; Figure 4 It is a schematic diagram of the outer side of the end of the screening component in the coarse and fine aggregate screening device of the present invention; Figure 5 It is a schematic diagram of the inner side of the end of the screening component in the coarse and fine aggregate screening device of the present invention; Figure 6 It is a three-dimensional schematic diagram of a protective cover in the coarse and fine aggregate screening device of the present invention; Figure 7 It is a schematic diagram of the interior of the connecting rod in the coarse and fine aggregate screening device of the present invention; Figure 8 It is a schematic diagram of a time delay assembly arranged outside a connecting rod in a coarse and fine aggregate screening device of the present invention; Fig. 9 It is a schematic diagram of arranging a screen plate on a screening rod in the coarse and fine aggregate screening device of the present invention.

[0017] The following are marked in the accompanying drawings: 1. Screening rod; 2. End plate; 3. Guide hole; 4. Connecting rod; 5. Arc rack; 6. Arc groove; 7. Connecting column; 8. Driving gear; 9. Driving motor; 10. Protective cover; 11. Support ring; 12. Feed pipe; 13. Retaining ring; 14. Support frame; 15. Support wheel; 16. Rotating motor; 17. Receiving plate; 18. Avoiding groove; 19. Connecting shaft; 20. Screw; 21. Connecting spring; 22. Locking nut; 23. Fixed plate; 24. Inner rod; 25. Outer rod; 26. Sliding groove; 27. Sliding block; 28. Traction spring; 29. ​​Fixed vertical plate; 30. Mounting plate; 31. Fixed horizontal plate; 32. Rotating shaft; 33. Retaining plate; 34. Reset spring; 35. Rubber retaining strip; 36. Screen plate. DETAILED DESCRIPTION

[0018] like Figure 1 to Figure 9 As shown, the present invention is a coarse and fine aggregate screening device for recycling building concrete, comprising a screening component, a material receiving component and a driving component, wherein the driving component is used to drive the screening component to rotate, the screening component is used to separate the coarse aggregate and the fine aggregate, and the material receiving component is used to discharge the coarse aggregate and the fine aggregate separated by the screening component respectively; Among them, the screening component includes a symmetrically arranged end plate 2, a through hole is provided in the middle of the end plate 2, and a plurality of circumferentially evenly distributed guide holes 3 are provided on the outer side of the through hole. The shape of the guide hole 3 is preferably rectangular, and a screening rod 1 is provided in each guide hole 3. The end of the screening rod 1 is located in the guide hole 3, and the diameter of the screening rod 1 matches the width of the guide hole 3. A plurality of groups of pulling components are provided on the end plate 2 outside the guide hole 3, and the plurality of groups of pulling components can move independently. The plurality of groups of pulling components are staggered. The purpose of the staggered setting is to avoid interference in mutual movement. Specifically, the pulling component includes an arc-shaped rack 5, and an arc-shaped groove 6 is provided on the end plate 2. The arc-shaped rack 5 is slidably connected to the arc-shaped groove 6 Inside, a driving gear 8 is provided on the outer side of the arc-shaped rack 5, and the driving gear 8 and the arc-shaped rack 5 are meshed. A driving motor 9 is provided on the end plate 2, and the driving motor 9 is fixed on the end plate 2, and the output end of the driving motor 9 is fixed on the driving gear 8. Connecting rods 4 are provided on the screening rods 1, and one end of several connecting rods 4 is respectively rotatably connected to the screening rod 1, and the other ends of several connecting rods 4 are respectively rotatably connected to several arc-shaped racks 5. The driving motor 9 drives the driving gear 8 to rotate, and the driving gear 8 drives the arc-shaped rack 5 to rotate. The arc-shaped rack 5 pulls the connecting rod 4 to move, and drives the screening rod 1 to move in the guide groove, thereby adjusting the spacing between adjacent screening rods 1.

[0019] The working principle of the above technical solution is: like Figure 4 As shown, if four groups of pulling components are provided, since each group of pulling components can move independently, the rotation of the driving motor 9 can drive the driving gear 8 to rotate, and then drive the arc-shaped rack 5 to rotate. The rotation of the arc-shaped rack can drive the connecting rod 4 to rotate and move, and then change the position of the screening rod 1 in the guide hole 3, so that the screening rod 1 can be close to the center of the circle of the end plate 2 or close to the center of the circle of the end plate 2. Therefore, the spacing between adjacent screening rods 1 can be adjusted, and then the screening width of the adjacent screening rods 1 for fine aggregates during screening (which can be understood as the size of the sieve holes) can be changed, so that fine aggregates of different diameters can be screened. At the same time, it is not difficult to understand that a position sensor (existing technology) can be set on each driving motor 9, that is, when the pulling assembly moves to the upper position (such as Figure 4The upper left side of the middle end plate 2 refers to a spatial position), and the driving motor 9 at this position is controlled to move, so that the connecting rod 4 drives the screening rod 1 to move away from the center of the end plate 2, that is, at this time, the spacing between the adjacent screening rods 1 at this location becomes larger, and the coarse aggregate blocked therein can be loosened, so that the coarse aggregate falls downward under the action of gravity, thereby avoiding the problem of blockage. When the spacing between adjacent screening rods 1 moves to the set value, the driving motor 9 is reset, so that the spacing between the screening rods 1 is restored to the initial screening width. It is not difficult to understand that the pulling assembly at the lower position is in contact with the coarse and fine aggregates at this time and will not move, and under the meshing limit of the arc rack 5 and the driving gear 8, the position of the screening rod 1 will not move, and the pulling assembly located at the upper part is disengaged from the coarse and fine aggregates at this time, and thus changing the screening spacing will not cause leakage.

[0020] It should be noted that the wires of the drive motor 9 can be connected through a conductive slip ring to avoid rotational entanglement. Of course, a wireless motor in the prior art can also be used. Specifically, the wireless motor is a device that combines wireless power transmission technology with the principles of traditional motors. It transmits electrical energy wirelessly, eliminates the limitation of wired connection in traditional motors, and improves the flexibility and reliability of the system.

[0021] In one feasible method, a plurality of connecting columns 7 with T-shaped cross sections are provided in the arc groove 6, the vertical portions of the connecting columns 7 pass through the arc groove 6 and are fixed on the arc rack 5, and the transverse portions of the connecting columns 7 are in sliding contact with the end plate 2. This connection method can limit the translation of the arc rack 5 and enable the arc rack 5 to rotate on the surface of the arc groove 6.

[0022] In one practicable manner, the connecting rod 4 includes an inner rod 24 and an outer rod 25, one end of the outer rod 25 is provided with a sliding groove 26 toward the middle, one end of the inner rod 24 is provided with a sliding block 27, one end of the sliding block 27 is fixed to the end of the inner rod 24, the other end of the sliding block 27 is slidably connected to the sliding groove 26, a plurality of traction springs 28 are provided in the sliding groove 26, one end of the traction spring 28 is fixed to the other end of the sliding block 27, and the other end of the traction spring 28 is fixed to the end side of the sliding groove 26.

[0023] When the connecting rod 4 drives the screening rod 1 to move outward, due to the friction between the screening rod 1 and the guide hole 3, the arc-shaped rack 5 will first drive the outer rod 25 to move outward, that is, the traction spring 28 is in a pull rope state at this time, and when the traction spring 28 is stretched to a certain length, the force applied to the inner rod 24 is greater than the friction force, that is, the inner rod 24 will move upward rapidly under the action of the traction spring 28 and splice with the end of the outer plate. In this setting, when the inner rod 24 moves rapidly, it will drive the screening rod 1 to move rapidly, and then stop suddenly, so as to apply a vibration torque to the fine aggregate adhered to the screening rod 1. At this time, the fine aggregate adhered to it will be detached, so as to avoid the adhesion of wet fine aggregate to the screening rod 1, resulting in blockage caused by changes in the screening spacing, and to avoid the need to clean the screening rod 1 later. It is easy to understand that, with this arrangement, when the connecting rod 4 is in the lower position, since the ends of the inner rod 24 and the outer rod 25 are in contact, no slippage occurs, thereby providing stable support for the coarse and fine aggregates inside.

[0024] In one feasible manner, a delay structure is provided on the outer side of the connecting rod 4, and the delay structure includes a fixed vertical plate 29, one end of which is detachably connected to the end plate 2, and is installed after adjusting the spacing between adjacent screening rods 1. Of course, it is preferred to set the fixed cross plate 31 as a retractable plate, so that the extended length can be adjusted to adapt to different screening widths. When the position of the connecting rod 4 changes, a fixed cross plate 31 is provided on the other end of the fixed vertical plate 29, and one end of the fixed cross plate 31 is rotatably connected to the mounting plate 30 provided on the fixed vertical plate 29, and is connected through a rotating shaft 32. A return spring 34 and a baffle 33 are respectively provided on both sides of the plate 31. The baffle 33 is arranged toward the arc-shaped rack 5. One end of the return spring 34 is connected to the fixed vertical plate 29, and the other end of the return spring 34 is connected to the fixed horizontal plate 31. One end of the baffle 33 is connected to the fixed vertical plate 29, and the other end of the baffle 33 is abutted against the side surface of the fixed horizontal plate 31. A rubber baffle 35 is provided on the inner rod 24 of the connecting rod 4, and one end of the rubber baffle 35 is fixed to the inner rod 24, and the other end of the rubber baffle 35 is slidably abutted on a side surface of the fixed horizontal plate 31 connected to the return spring 34.

[0025] The working principle of the delay structure is: When the connecting rod 4 drives the screening rod 1 to move outward, the rubber baffle 35 will block the displacement of the inner rod 24, that is, at this time the inner rod 24 can rotate with the outer plate, but cannot change the distance relative to the length direction of the guide hole 3, that is, when the outer rod 25 moves to a certain position, the traction spring 28 is also in a stretched state, and with the rotation of the inner rod 24, the end of the rubber baffle 35 will be separated from the end of the fixed cross plate 31. At the moment of separation, under the action of the traction spring 28, the inner rod 24 and the screening rod 1 will be driven to move quickly toward the end of the outer rod 25, and then be blocked by the end of the outer rod 25 to stop moving, and under the action of the inertial road bureau, the fine aggregate adhered thereto will be separated from the screening rod 1, thereby ensuring the cleanliness of the surface of the screening rod 1, and then ensuring that the size of the screening spacing is relatively stable. This setting method can ensure that the inner rod 24 will delay movement, and avoid the problem of the inner rod 24 and the outer rod 25 moving together only by friction (if the friction is relatively small).

[0026] In one practicable manner, a sieve plate 36 is sleeved on the portion of the screening rod 1 between the symmetrically arranged end plates 2. The sieve plate 36 is arranged in an arc shape. The arrangement of the sieve plate 36 is equivalent to enlarging the diameter of the screening rod 1, thereby reducing the arrangement of the screening rod 1, and increasing the distance between the ends of adjacent screening rods 1, thereby ensuring that installation space is reserved for the arrangement of other components.

[0027] In an operative manner, the driving assembly includes a support frame 14, both ends of the support frame 14 are symmetrically provided with supporting wheels 15, at least one supporting wheel 15 is provided with a rotating motor 16, a supporting ring 11 is provided on the outer surface of the end plate 2, one end of the supporting ring 11 is connected to the end plate 2, and the outer surface of the supporting ring 11 is in contact with the supporting wheel 15. The structure is similar to the driving part of the drum screen in the prior art.

[0028] In one practicable manner, a protective cover 10 is provided between the end plate 2 and the support ring 11, a feed port is provided in the middle of the protective cover 10, one end of the protective cover 10 is fixed to the end plate 2, the other end of the protective cover 10 is fixedly connected to the support ring 11, a feed pipe 12 is provided in the feed port, and the outer surface of the feed pipe 12 is fixed to the feed port. The provision of the protective cover 10 and the feed pipe 12 can shield and cover components such as the arc-shaped rack 5, and prevent coarse and fine aggregates from contacting with them, resulting in the problem of jamming.

[0029] In one feasible manner, a retaining ring 13 is provided on the inner side surface of the end plate 2, one end of the retaining ring 13 is fixed on the end plate 2, and the retaining ring 13 is located between the screening rod 1 and the arc groove 6. The retaining ring 13 can receive the fine aggregate discharged from the end of the screening rod 1 to prevent the fine aggregate from affecting components such as the rotating motor 16 and the arc groove 6.

[0030] In one practicable manner, the material receiving assembly includes a symmetrically arranged fixed plate 23, a connecting shaft 19 is provided at the end of the fixed plate 23, a material receiving plate 17 is provided on the connecting shaft 19, the middle part of the material receiving plate 17 is rotatably connected to the connecting shaft 19, an avoidance groove 18 is provided in the middle part of the material receiving plate 17, a screw 20 is provided at one end of the avoidance groove 18, the screw 20 is located in the avoidance groove 18, a connecting spring 21 is sleeved on the screw 20, one end of the connecting spring 21 is fixed to the material receiving plate 17, a locking nut 22 is provided at the other end of the connecting spring 21, and the locking nut 22 is threadedly connected to the screw 20.

[0031] The inclination direction of the receiving plate 17 can be changed by changing the position of the locking nut 22 on the screw 20, that is, when fine aggregate is discharged, the receiving plate 17 is inclined in one direction, that is, the inclined receiving plate 17 will guide the fine aggregate to be transported to one side of the support frame 14, and under the action of the connecting spring 21, the discharged fine aggregate falls onto the receiving plate 17, which will drive the receiving plate 17 to shake, thereby improving the conveying effect of the fine aggregate. Similarly, when it is necessary to expand the spacing of the bottom screening rods 1 and discharge coarse aggregate, it is only necessary to tilt the receiving plate 17 toward the other end, so that the discharged coarse and fine aggregates can be respectively transported to both sides of the support frame 14 for easy recycling. Of course, when discharging coarse aggregate, the screening assembly can also be driven by the hydraulic cylinder to tilt as a whole, and then discharged from the end.

[0032] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A coarse and fine aggregate screening device for recycling building concrete, characterized in that: It comprises a screening component, a material receiving component and a driving component, wherein the driving component is used to drive the screening component to rotate, the screening component is used to separate the coarse aggregate and the fine aggregate, and the material receiving component is used to respectively discharge the coarse aggregate and the fine aggregate separated by the screening component; The screening assembly comprises a symmetrically arranged end plate (2), a through hole is provided in the middle of the end plate (2), a plurality of circumferentially evenly distributed guide holes (3) are provided on the outer side of the through hole, a screening rod (1) is provided in each of the guide holes (3), the end of the screening rod (1) is located in the guide hole (3), a plurality of groups of pulling assemblies are provided on the end plate (2) outside the guide hole (3), the plurality of groups of pulling assemblies are staggered, the pulling assembly comprises an arc-shaped rack (5), an arc-shaped groove (6) is provided on the end plate (2), the arc-shaped rack (5) is slidably connected in the arc-shaped groove (6), a driving gear (8) is provided on the outer side of the arc-shaped rack (5), the driving gear (8) and the arc-shaped rack (5) are meshed, a driving motor (9) is provided on the end plate (2), and the driving motor (9) is provided on the end plate (2). The driving motor (9) is fixed on the end plate (2), and the output end of the driving motor (9) is fixed on the driving gear (8). The screening rods (1) are provided with connecting rods (4). One end of a plurality of the connecting rods (4) is respectively rotatably connected to the screening rods (1), and the other ends of a plurality of the connecting rods (4) are respectively rotatably connected to a plurality of the arc-shaped racks (5). When any group of the pulling components moves to the upper space position, the driving motor (9) drives the driving gear (8) to rotate, the driving gear (8) drives the arc-shaped rack (5) to rotate, the arc-shaped rack (5) pulls the connecting rod (4) to move, and drives the screening rods (1) to move in the guide groove, thereby adjusting the spacing between adjacent screening rods (1), and thereby allowing the coarse aggregate clamped between the adjacent screening rods (1) to be discharged.

2. The coarse and fine aggregate screening device for recycling building concrete according to claim 1, characterized in that: A plurality of connecting columns (7) having a T-shaped cross section are arranged in the arc-shaped groove (6); the vertical portion of the connecting column (7) passes through the arc-shaped groove (6) and is fixed on the arc-shaped rack (5); and the horizontal portion of the connecting column (7) is in sliding contact with the end plate (2).

3. The coarse and fine aggregate screening device for recycling building concrete according to claim 1, characterized in that: The connecting rod (4) comprises an inner rod (24) and an outer rod (25), one end of the outer rod (25) is provided with a sliding groove (26) towards the middle, one end of the inner rod (24) is provided with a sliding block (27), one end of the sliding block (27) is fixed to the end of the inner rod (24), the other end of the sliding block (27) is slidably connected in the sliding groove (26), a plurality of traction springs (28) are provided in the sliding groove (26), one end of the traction spring (28) is fixed to the other end of the sliding block (27), and the other end of the traction spring (28) is fixed to the end side of the sliding groove (26).

4. The coarse and fine aggregate screening device for recycling building concrete according to claim 3, characterized in that: A delay structure is provided on the outer side of the connecting rod (4), the delay structure comprising a fixed vertical plate (29), one end of the fixed vertical plate (29) being detachably connected to the end plate (2), a fixed horizontal plate (31) being provided on the other end of the fixed vertical plate (29), one end of the fixed horizontal plate (31) being rotatably connected to the fixed vertical plate (29), a return spring (34) and a baffle (33) being provided on both sides of the fixed horizontal plate (31), the baffle (33) being arranged toward the arc-shaped rack (5), one end of the return spring (34) being connected to the fixed vertical plate (29), and one end of the return spring (34) being connected to the fixed vertical plate (29). The fixing plate (29) is connected to the fixing plate (29), the other end of the return spring (34) is connected to the fixing plate (31), one end of the baffle plate (33) is connected to the fixing plate (29), the other end of the baffle plate (33) is abutted against the side surface of the fixing plate (31), the inner rod (24) of the connecting rod (4) is provided with a rubber baffle (35), one end of the rubber baffle (35) is fixed to the inner rod (24), and the other end of the rubber baffle (35) is slidably abutted against a side surface of the fixing plate (31) connected to the return spring (34).

5. The coarse and fine aggregate screening device for recycling building concrete according to claim 1, characterized in that: A sieve plate (36) is sleeved on the portion of the sieve rod (1) located between the symmetrically arranged end plates (2), and the sieve plate (36) is arranged in an arc shape.

6. The coarse and fine aggregate screening device for recycling building concrete according to claim 1, characterized in that: The driving assembly comprises a support frame (14), both ends of the support frame (14) are symmetrically provided with supporting wheels (15), at least one of the supporting wheels (15) is provided with a rotating motor (16), and a supporting ring (11) is provided on the outer surface of the end plate (2), one end of the supporting ring (11) is connected to the end plate (2), and the outer surface of the supporting ring (11) is in contact with the supporting wheel (15).

7. The coarse and fine aggregate screening device for recycling building concrete according to claim 6, characterized in that: A protective cover (10) is provided between the end plate (2) and the support ring (11), a feed port is provided in the middle of the protective cover (10), one end of the protective cover (10) is fixed to the end plate (2), the other end of the protective cover (10) is fixedly connected to the support ring (11), a feed pipe (12) is provided in the feed port, and the outer surface of the feed pipe (12) is fixed to the feed port.

8. The coarse and fine aggregate screening device for recycling building concrete according to claim 7, characterized in that: A retaining ring (13) is provided on the inner side surface of the end plate (2), one end of the retaining ring (13) is fixed to the end plate (2), and the retaining ring (13) is located between the screening rod (1) and the arc-shaped groove (6).

9. The coarse and fine aggregate screening device for recycling building concrete according to claim 1, characterized in that: The material receiving assembly comprises a symmetrically arranged fixing plate (23), an end of the fixing plate (23) is provided with a connecting shaft (19), a material receiving plate (17) is provided on the connecting shaft (19), a middle portion of the material receiving plate (17) is rotatably connected to the connecting shaft (19), a middle portion of the material receiving plate (17) is provided with an avoidance groove (18), one end of the avoidance groove (18) is provided with a screw rod (20), the screw rod (20) is located in the avoidance groove (18), a connecting spring (21) is sleeved on the screw rod (20), one end of the connecting spring (21) is fixed to the material receiving plate (17), and a locking nut (22) is provided on the other end of the connecting spring (21), and the locking nut (22) is threadedly connected to the screw rod (20).

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